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Question: Which year were the 118 chemical elements discovered?

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List of the chemical elements with the year (sorted in ascending order) when they were first defined as the pure element are as follows: (source)

  1. Copper --------> 9000 BC 
  2. Lead --------> 7000 BC 
  3. Gold --------> Before 6000 BC 
  4. Silver --------> Before 5000 BC 
  5. Iron --------> Before 5000 BC 
  6. Carbon --------> 3750 BC 
  7. Tin --------> 3500 BC 
  8. Sulfur --------> Before 2000 BC 
  9. Mercury --------> 1500 BC 
  10. Zinc --------> Before 1000 BC 
  11. Platinum --------> c. 600 BC – AD 200 
  12. Arsenic --------> Before AD 815 
  13. Antimony --------> Before AD 815 
  14. Bismuth --------> Before AD 1000 
  15. Phosphorus --------> 1669
  16. Cobalt --------> 1735
  17. Nickel --------> 1751
  18. Hydrogen --------> 1766
  19. Oxygen --------> 1771
  20. Nitrogen --------> 1772
  21. Chlorine --------> 1774
  22. Manganese --------> 1774
  23. Molybdenum --------> 1778
  24. Tungsten --------> 1781
  25. Tellurium --------> 1782
  26. Uranium --------> 1789
  27. Titanium --------> 1791
  28. Chromium --------> 1797
  29. Niobium --------> 1801
  30. Tantalum --------> 1802
  31. Palladium --------> 1802
  32. Cerium --------> 1803
  33. Osmium --------> 1803
  34. Iridium --------> 1803
  35. Rhodium --------> 1804
  36. Potassium --------> 1807
  37. Sodium --------> 1807
  38. Barium --------> 1808
  39. Strontium --------> 1808
  40. Calcium --------> 1808
  41. Magnesium --------> 1808
  42. Silicon --------> 1808
  43. Aluminium --------> 1808
  44. Zirconium --------> 1808
  45. Beryllium --------> 1808
  46. Boron --------> 1808
  47. Yttrium --------> 1808
  48. Fluorine --------> 1810
  49. Iodine --------> 1811
  50. Lithium --------> 1817
  51. Cadmium --------> 1817
  52. Selenium --------> 1817
  53. Bromine --------> 1825
  54. Thorium --------> 1829
  55. Vanadium --------> 1830
  56. Lanthanum --------> 1838
  57. Erbium --------> 1843
  58. Terbium --------> 1843
  59. Ruthenium --------> 1844
  60. Caesium --------> 1860
  61. Rubidium --------> 1861
  62. Thallium --------> 1861
  63. Indium --------> 1863
  64. Helium --------> 1868
  65. Gallium --------> 1875
  66. Ytterbium --------> 1878
  67. Holmium --------> 1878
  68. Thulium --------> 1879
  69. Scandium --------> 1879
  70. Samarium --------> 1879
  71. Gadolinium --------> 1880
  72. Praseodymium --------> 1885
  73. Neodymium --------> 1885
  74. Germanium --------> 1886
  75. Dysprosium --------> 1886
  76. Argon --------> 1894
  77. Europium --------> 1896
  78. Krypton --------> 1898
  79. Neon --------> 1898
  80. Xenon --------> 1898
  81. Polonium --------> 1898
  82. Radium --------> 1898
  83. Radon --------> 1899
  84. Actinium --------> 1902
  85. Lutetium --------> 1906
  86. Protactinium --------> 1913
  87. Hafnium --------> 1922
  88. Rhenium --------> 1925
  89. Technetium --------> 1937
  90. Francium --------> 1939
  91. Neptunium --------> 1940
  92. Astatine --------> 1940
  93. Plutonium --------> 1940–1941 
  94. Curium --------> 1944
  95. Americium --------> 1944
  96. Promethium --------> 1945
  97. Berkelium --------> 1949
  98. Californium --------> 1950
  99. Einsteinium --------> 1952
  100. Fermium --------> 1952
  101. Mendelevium --------> 1955
  102. Lawrencium --------> 1961
  103. Nobelium --------> 1966
  104. Rutherfordium --------> 1969
  105. Dubnium --------> 1970
  106. Seaborgium --------> 1974
  107. Bohrium --------> 1981
  108. Meitnerium --------> 1982
  109. Hassium --------> 1984
  110. Darmstadtium --------> 1994
  111. Roentgenium --------> 1994
  112. Copernicium --------> 1996
  113. Flerovium --------> 1998
  114. Livermorium --------> 2000
  115. Oganesson --------> 2002
  116. Moscovium --------> 2003
  117. Nihonium --------> 2003–2004 
  118. Tennessine --------> 2009

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